Paul G. |
2019-08-30

Works as advertised. You have to let it run for a min before you get completely clean water meaning I have a TDS meter and when you first crack it open the water reads in the 100s but after about 1 min you get 5ppm no problem. I use it in the coffee machine and fish tank. It is a dire necessity here in S Fla. recommended

jazzy |
2019-12-07

It works and I dont taste any different from my previous system. It is not noisy like one viewer wrote but since it is a tankless system, water pours our very slowly. I like more space under the sink. :)

Ray Bernard |
2020-04-17

I did a lot of research and I never write reviews but I did feel compelled to share my experience with the Greatwell. I learned 6 months I had some undesirable elements in my well water and quickly went into research mode. My kitchen is small so we do not have room for a traditional RO system. Upon researching I liked that the Greatwell was the only one I could find that complied to government standards and was made by a reputable company (iSpring). Install was easy and component has been great for first 6 months. My TDS was 150 and the Greatwell brings it down to about 12. For me, piece of mind with drinking water is huge.

Cassandra |
2019-09-04

We purchased this for our new office rather paying for water delivery or keep buying bottled waters, good for small offices and home use. Received the product as described, it doesn’t take out much space under the sink and the installation was easy. Water comes out from the filters show 4ppm on the TDS ppm meter comparing to 50 tap water. Everyone tries it loves it!

HalfWhit |
2020-06-28

So we like the size and compactness of this unit . The water flow is a little slow but i can live with that . Occasionally after you turn it off or sometimes all by itself out well make a really loud sucking noise . I have video of it if anyone is interested . Is this normal? Note i had the matching faucet installed. I didn't use the one that comes with the kit .

SteveR |
2020-02-24

I decided to replace my 20+ year old RO unit with a new tankless model. When researching and shopping I found only two good products out there: the ROG4000 and the Waterdrop WD-G3-W tankless system. I chose the ROG400 partly because of the lower cost and partly due to its dimensions fitting better under my sink. Installing the ROG400 took much longer than expected, somewhere in the 2+ hour range, in part because I had to remove the garbage disposal to install the faucet. Plus I chose a corner opening on the sink which required me to remove a wooden corner brace on the cabinet. Once installed the system fired up fine. I should also note the ROG400 User's Manual/Instruction is pretty lousy! Initial testing of the output showed ~40-50 ppm of hardness compared to the ~450 ppm of city water input. I did have some minor dripping at the faucet spout tip, and so contacted iSpring Customer Service to see if I could get a cut sheet or maintenance guide for the faucet. Nick at iSpring sent me a new faucet since the initial one was still under warranty but was unable to provide a maintenance guide. The new faucet is similar in style but has slightly different lines. It's also slightly easier to install due to the undercounted mounting system. Once up and running, the noise and vibration is somewhat a nuisance, even after placing the unit on a padded surface but easy to get used to. Due to the smaller tubing size-¼" vs ⅜" on the old RO unit-the output flow is about half compared to the old RO unit. But that is also easy to get used to. Nick at iSpring was very helpful and courteous through it all. Despite the negative issues listed above, overall the ROG400 unit will hopefully prove to be a good solution that only time will tell.

jcho |
2020-04-03

I purchased it on Nov 2019 and have been using for about a year. I am so happy with my purchase and will get another one for my son as a house warming gift! I am highly recommended this product. You won’t be disappointed. The customer service was excellent that they returned my call on very next day:)

Kristopher J. Kemper |
2014-12-15

I'll give this 4 stars for being what I wanted and at the best price and appearing to work (a good filter that removes VOC's and doesn't waste water or require a separate tank). I took a star off for the installation manual. Installation was tricky, mostly because I have never installed an under sink water filter before. In retrospect, there aren't that many steps and I probably could do it again in 30 minutes. As it was, it did take multiple hours with some indecision and a trip to home depot. Here are my particular installation notes, which are meant to compliment what other reviewers have said. This is not a complete guide. 1.) The instructions do suck. The wording is hard to follow and the pictures don't really illustrate what to do (and they are low res). One picture has an arrow to where a drainage tube would go, but this model doesn't do reverse osmosis and doesn't need one, but that detail causes confusion. Incidentally, the tape on the bottom of the box said "Reverse Osmosis" on it which made me questions things more. The most valuable thing in the entire book is a single picture called "water route diagram" that shows you how the main unit should look when hooked up. 2.) The cold water tap/adapter that came with the unit was 1/2 inch in size. As mentioned by others, my cold water supply is a 3/8 inch connection. However, the end of the flex pipe that connects to the faucet is 1/2 inch, so I was able to install the adapter up there without any extra parts. Sadly, I ended up going to home depot studying the various tubes and adapters before I realized this would work. 3.) There are little plastic cones going into the tube valves of the unit. Nothing mentioned them, so I watched a video for a different model to know how to proceed (I didn't want to break anything which I think I would have if I tried to yank them out). There are little blue horseshoe shaped bits of plastic holding an inner plastic piece in place. Pull those blue horseshoes off, push in the inner plastic part around the cone towards the unit, and then the cones will release. The reverse action is similar to how the tubes are installed. 4.) All my tubing connections leaked the first time because I didn't use enough force to push them in. It takes a decent amount of force to get the tubes to slide through the inner seals/washers for them to be water tight. With wet hands, I had to remove the tubes and retry several times for it not to leak. 5.) Like others said, red tube goes from the cold water valve to the filtered water faucet. The blue goes to the right side of the unit next to the stage 1 sediment filter, and the white tube exits the left side next to the stage 3 block carbon filter. I read another review that claimed the order was left to right instead of right to left. That was not true for me and the order of the 3 filter stages on my unit matched the 3 pictures of the models on the front of the manual. 6.) If your sink had a cover over 2 soap or water filter holes and you had to expose 2 holes to install this filter, hardware stores sell single sink hole covers that screw in and cover up the extra hole. I don't plan on testing my water in any way. I assume this filter does it's job. The water tastes good to me though I doubt my ability to judge that. It's still coming out mildly cloudy after 5 minutes of running it, so I'll post back if I'm unhappy with how things look later on.

Parker Bennett |
2021-02-07

I can not find replacement filters anywhere. Any advice from anyone?

Marcos Troncoso |
2020-05-06

The water from the system was the same quality as the bottled water. Well satisfied with this purchase.